3v4l.org

run code in 200+ php & hhvm versions
<?php // The original function function a($i){$e=microtime(1)+$i;while(microtime(1)<$e);} // Use 'for' instead of 'while' function b($i){for($e=microtime(1)+$i;microtime(1)<$e;);} // Extract 'microtime' into a variable // Requires error_reporting(0) to suppress the "PHP Notice: Use of undefined constant microtime" // Use '-d error_reporting=0' in the command line function c($i){for($f=microtime,$e=$f(1)+$i;$f(1)<$e;);} // Squeeze the initialization of $f into its first use // PHP 7 only; it doesn't compile on older versions function d($i){for($e=($f=microtime)(1)+$i;$f(1)<$e;);}
based on ecbX4
Output for 7.0.0 - 7.3.1
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.6.28
Parse error: syntax error, unexpected '(', expecting ';' in /in/fU11Y on line 16
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '(', expecting ';' in /in/fU11Y on line 16
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `';'' in /in/fU11Y on line 16
Process exited with code 255.